diff --git a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
index ee76b27cf1c..935a0522047 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java
@@ -660,7 +660,7 @@ public class DefaultErrorMessages {
         MAP.put(SUPERTYPE_NOT_A_CLASS_OR_INTERFACE, "Only classes and interfaces may serve as supertypes");
         MAP.put(SUPERTYPE_IS_EXTENSION_FUNCTION_TYPE, "Extension function type is not allowed as supertypes");
         MAP.put(SUPERTYPE_INITIALIZED_IN_INTERFACE, "Interfaces cannot initialize supertypes");
-        MAP.put(SUPERTYPE_IS_SUSPEND_FUNCTION_TYPE, "Suspend function type is not allowed as supertypes");
+        MAP.put(SUPERTYPE_IS_SUSPEND_FUNCTION_TYPE, "Suspend function type is allowed as a supertype only since version 1.6");
         MAP.put(SUPERTYPE_IS_KSUSPEND_FUNCTION_TYPE, "KSuspendFunctionN interfaces are not allowed as supertypes");
         MAP.put(MIXING_SUSPEND_AND_NON_SUSPEND_SUPERTYPES, "Mixing suspend and non-suspend supertypes is not allowed");
         MAP.put(CLASS_IN_SUPERTYPE_FOR_ENUM, "Enum class cannot inherit from classes");
diff --git a/compiler/testData/integration/ant/jvm/languageVersion/build.log.expected b/compiler/testData/integration/ant/jvm/languageVersion/build.log.expected
index 1210ec1b779..37c54714267 100644
--- a/compiler/testData/integration/ant/jvm/languageVersion/build.log.expected
+++ b/compiler/testData/integration/ant/jvm/languageVersion/build.log.expected
@@ -3,7 +3,7 @@ Buildfile: [TestData]/build.xml
 
 build:
   [kotlinc] Compiling [[TestData]/main.kt] => [[Temp]/hello.jar]
-  [kotlinc] [TestData]/main.kt:1:15: error: suspend function type is not allowed as supertypes
+  [kotlinc] [TestData]/main.kt:1:15: error: suspend function type is allowed as a supertype only since version 1.6
   [kotlinc] interface A : suspend () -> Unit
   [kotlinc]               ^
 
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
index aa98813e3ef..926ca21bf2f 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
@@ -68,7 +68,7 @@ class SimpleKotlinGradleIT : KGPBaseTest() {
     fun testLanguageVersion(gradleVersion: GradleVersion) {
         project("languageVersion", gradleVersion) {
             buildAndFail("build") {
-                assertOutputContains("Suspend function type is not allowed as supertypes")
+                assertOutputContains("Suspend function type is allowed as a supertype only since version 1.6")
             }
         }
     }
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
index eb0a824cb3e..621c2281997 100644
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
+++ b/libraries/tools/kotlin-maven-plugin-test/src/it/test-languageVersion/verify.bsh
@@ -1,4 +1,4 @@
 source(new File(basedir, "../../../verify-common.bsh").getAbsolutePath());
 
 assertBuildLogHasLine("[INFO] BUILD FAILURE");
-assertBuildLogHasLineThatContains("Suspend function type is not allowed as supertypes");
+assertBuildLogHasLineThatContains("Suspend function type is allowed as a supertype only since version 1.6");